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https://ru.speaklanguages.com/%D0%B0%D0%BD%D0%B3%D0%BB%D0%B8%D0%B9%D1%81%D0%BA%D0%B8%D0%B9/%D0%BB%D0%B5%D0%BA%D1%81%D0%B8%D0%BA%D0%B0/%D1%81%D1%82%D1%80%D0%B0%D0%BD%D1%8B-%D0%B8-%D0%BD%D0%B0%D1%86%D0%B8%D0%BE%D0%BD%D0%B0%D0%BB%D1%8C%D0%BD%D0%BE%D1%81%D1%82%D0%B8

2. https://skyeng.ru/articles/strana-yazyk-natsionalnost

3. http://enginform.com/article/nationalities